babel-loader jsx SyntaxError：意外令牌[重复]

本文翻译自：babel-loader jsx SyntaxError: Unexpected token [duplicate]

This question already has an answer here: 这个问题已经在这里有了答案：

Babel file is copied without being transformed 9 answers 通天塔文件被复制而不进行转换 9答案

I'm a beginner in React + Webpack. 我是React + Webpack的初学者。

I found a weird error in my hello world web app. 我在Hello World Web应用程序中发现了一个奇怪的错误。

I'm using babel-loader in webpack to help me convert jsx into js, but it seems like babel can't understand jsx syntax. 我在webpack中使用babel-loader来帮助我将jsx转换为js，但是babel似乎无法理解jsx语法。

Here are my dependencies: 这是我的依赖项：

"devDependencies": { "babel-core": "^6.0.14", "babel-loader": "^6.0.0", "webpack": "^1.12.2", "webpack-dev-server": "^1.12.1" }, "dependencies": { "react": "^0.14.1" }

Here is my webpack.config.js 这是我的webpack.config.js

var path = require('path'); module.exports = { entry: ['webpack/hot/dev-server',path.resolve(__dirname, 'app/main.js')], output: { path: path.resolve(__dirname, 'build'), filename: 'bundle.js' }, module: { loaders: [ { test: /\.js$/, exclude: /node_modules/, loader: "babel-loader"} ] } };

Here is my app/main.js 这是我的app/main.js

var React = require("react"); React.render(<h1>hello world</h1>,document.getElementById("app"));

And this is the error message 这是错误消息

ERROR in ./app/main.js Module build failed: SyntaxError: ~/**/app/main.js: Unexpected token (2:13) 1 | var React = require("react"); > 2 | React.render(<h1>hello world</h1>,document.getElementById("app")); | ^ at Parser.pp.raise (~/**/node_modules/babylon/lib/parser/location.js:24:13)

Thanks for you guys. 谢谢你们

---

#1楼

参考：https://stackoom.com/question/2GOaC/babel-loader-jsx-SyntaxError-意外令牌-重复

---

#2楼

Add "babel-preset-react" 添加“ babel-preset-react”

npm install babel-preset-react

and add "presets" option to babel-loader in your webpack.config.js 并在webpack.config.js中向babel-loader添加“预设”选项

(or you can add it to your .babelrc or package.js: http://babeljs.io/docs/usage/babelrc/ ) （或者您可以将其添加到您的.babelrc或package.js： http ://babeljs.io/docs/usage/babelrc/）

Here is an example webpack.config.js: 这是一个webpack.config.js示例：

{ test: /\.jsx?$/, // Match both .js and .jsx files exclude: /node_modules/, loader: "babel", query: { presets:['react'] } }

Recently Babel 6 was released and there was a major change: https://babeljs.io/blog/2015/10/29/6.0.0 最近发布了Babel 6，并进行了重大更改： https : //babeljs.io/blog/2015/10/29/6.0.0

If you are using react 0.14, you should use ReactDOM.render() (from require('react-dom') ) instead of React.render() : https://facebook.github.io/react/blog/#changelog 如果您使用ReactDOM.render() 0.14，则应该使用ReactDOM.render() （来自require('react-dom') ）而不是React.render() ： https : React.render()

UPDATE 2018 更新2018

Rule.query has already been deprecated in favour of Rule.options. 不推荐使用Rule.query，而使用Rule.options。 Usage in webpack 4 is as follows: webpack 4中的用法如下：

npm install babel-loader babel-preset-react

Then in your webpack configuration (as an entry in the module.rules array in the module.exports object) 然后在您的webpack配置中（作为module.exports对象中module.rules数组中的条目）

{ test: /\.jsx?$/, exclude: /node_modules/, use: [ { loader: 'babel-loader', options: { presets: ['react'] } } ], }

---

#3楼

Since the answer above still leaves some people in the dark, here's what a complete webpack.config.js might look like: 由于上面的答案仍然使某些人望而却步，因此完整的webpack.config.js可能如下所示：

var path = require('path'); var config = { entry: path.resolve(__dirname, 'app/main.js'), output: { path: path.resolve(__dirname, 'build'), filename: 'bundle.js' }, module: { loaders: [{ test: /\\.jsx?$/, loader: 'babel', query: { presets:['es2015', 'react'] } }] }, }; module.exports = config;

---

#4楼

I ran into a similar issue when migrating from babel 5 to babel 6. 从babel 5迁移到babel 6时，我遇到了类似的问题。

I was just running babel to compile the src to lib folder babel src --out-dir lib 我只是在运行babel将src编译为lib文件夹babel src --out-dir lib

I will share my setup for babel 6: 我将分享Babel 6的设置：

Ensure you have the following babel 6 devDependencies installed 确保您已安装以下babel 6 devDependencies

"babel-core": "^6.7.6", "babel-loader": "^6.2.4", "babel-preset-es2015": "^6.6.0", "babel-preset-react": "^6.5.0", "babel-preset-stage-0": "^6.5.0"

Add your .babelrc file to the project: 将.babelrc文件添加到项目中：

{ "presets": ["es2015", "stage-0", "react"] }

---

#5楼

The following way has helped me (includes react-hot, babel loaders and es2015, react presets): 以下方法对我有所帮助（包括react-hot，babel装载程序和es2015，react预设）：

loaders: [ { test: /\.jsx?$/, exclude: /node_modules/, loaders: ['react-hot', 'babel?presets[]=es2015&presets[]=react'] } ]

---

#6楼

You can find a really good boilerplate made by Henrik Joreteg (ampersandjs) here: https://github.com/HenrikJoreteg/hjs-webpack 您可以在这里找到由Henrik Joreteg（＆sandjs）制作的非常好的样板： https ： //github.com/HenrikJoreteg/hjs-webpack

Then in your webpack.config.js 然后在您的webpack.config.js

var getConfig = require('hjs-webpack') module.exports = getConfig({ in: 'src/index.js', out: 'public', clearBeforeBuild: true, https: process.argv.indexOf('--https') !== -1 })